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Income Taxes - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards |  |  |  |  |  |
Provisional net charge due to new tax regulations |  | $ 11,800,000 |  | $ 11,800,000 |  |
Additional charge to revalue deferred tax assets |  |  | $ 700,000 |  |  |
Operating loss carryforwards, domestic |  |  | 9,500,000 |  |  |
Operating loss carryforwards, state and local |  |  | 588,200,000 |  |  |
Operating loss carryforwards, foreign |  |  | 270,500,000 |  |  |
Tax credit carryforwards |  |  | 42,600,000 |  |  |
Carryforwards expiring in 2019 |  |  | 9,400,000 |  |  |
Tax credit carryforwards expiring between 2019 and 2036 |  |  | 634,600,000 |  |  |
Increase (decrease) in valuation allowance |  |  | (21,600,000) | 35,100,000 |  |
Undistributed earnings of foreign subsidiaries |  |  | 129,300,000 |  |  |
Unrecognized tax benefit |  | 31,300,000 | 20,300,000 | 31,300,000 | $ 37,900,000 | $ 48,800,000
Net unrecognized tax benefits |  | 20,600,000 | 13,800,000 | 20,600,000 | 25,200,000 |
Unrecognized tax benefits that would impact the effective tax rate if recognized |  |  | 10,100,000 |  |  |
Gross accrued interest |  | 3,900,000 | 3,800,000 | 3,900,000 | 3,700,000 |
Net accrued interest |  | 2,500,000 | 2,900,000 | 2,500,000 | 2,400,000 |
Gross interest income included in income tax (provision) benefit |  |  | 100,000 | (200,000) | 1,800,000 |
Penalties excluded |  | $ 0 | 0 | 0 | 0 |
Excess tax benefits from stock-based compensation awards vested during the year |  |  | 2,200,000 |  |  |
Income tax benefit for worthless stock deduction |  |  | 33,000,000 | 77,600,000 |  |
Tax benefit related to various audit settlements, statute expirations, and other adjustments |  |  | 7,000,000 | 4,900,000 |  |
Gain on sale of dry cooling business |  |  | 0 | 0 | 18,400,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Dry Cooling Business |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |
Income taxes on gain from sale of business |  |  |  |  | (300,000) |
Gain on sale of dry cooling business | $ 18,400,000 |  |  |  | 18,400,000 |
Maximum |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range |  |  | $ 4,000,000 |  |  |
Foreign Jurisdictions |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |
Foreign losses generated for which no tax benefit was recognized |  |  |  | $ 68,200,000 | 13,700,000 |
Accounting Standards Update 2016-09 |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |
Tax benefit related to various audit settlements, statute expirations, and other adjustments |  |  |  |  | $ 2,400,000 |

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